net: phy: Provide Module 4 KSZ9477 errata (DS80000754C)

[tomoyo/tomoyo-test1.git] / drivers / net / dsa / microchip / ksz_common.c

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 6673122..42db767 100644 (file)
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c
@@ -2335,13 +2335,27 @@ static u32 ksz_get_phy_flags(struct dsa_switch *ds, int port)
 {
        struct ksz_device *dev = ds->priv;
 
-       if (dev->chip_id == KSZ8830_CHIP_ID) {
+       switch (dev->chip_id) {
+       case KSZ8830_CHIP_ID:
                /* Silicon Errata Sheet (DS80000830A):
                 * Port 1 does not work with LinkMD Cable-Testing.
                 * Port 1 does not respond to received PAUSE control frames.
                 */
                if (!port)
                        return MICREL_KSZ8_P1_ERRATA;
+               break;
+       case KSZ9477_CHIP_ID:
+               /* KSZ9477 Errata DS80000754C
+                *
+                * Module 4: Energy Efficient Ethernet (EEE) feature select must
+                * be manually disabled
+                *   The EEE feature is enabled by default, but it is not fully
+                *   operational. It must be manually disabled through register
+                *   controls. If not disabled, the PHY ports can auto-negotiate
+                *   to enable EEE, and this feature can cause link drops when
+                *   linked to another device supporting EEE.
+                */
+               return MICREL_NO_EEE;
        }
 
        return 0;